hughes



'(No Model.)

W. D. HUGHES.

- KNOB ATTACHMENT. No. 355,650. Patented Jan. 4, 1887.

anve-wl'oz UNITED STATES PATENT Fries.

WILLIAM D. HUGHES, OF WASHINGTON, DISTRICT OF COLUMBIA.

KNOB ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 355,650, dated January 4, 1887. Applioaion filed September 22,1886. Serial No. 214,295, (No model.)

To all whom it may concern:

Be it known that I, WILLIAM D. HUGHES, a citizen of the United States, residing at Washington, in the District of Columbia, have verse undercut groove at the extremity of its shank. Fig.2is a similar view of a removable flange with a transverse tenon formed thereon. Fig. 3 is an elevation of a knob-spindle. Fig. 4 is a perspective view of a door-knob with the removable flange and the tenon in place, also of a knob-spindle and a door-protector, in dotted lines. Fig. 5 is a circular rosette, obverse view. Fig. 6 is an oblong rosette, face view. Fig. 7 is a circular rosette, front view.

The object of my invention is to furnish an exceedingly novel, simple, and complete doorknob attachment.

The door-knob A has a shank, B, which shank is provided with a transverse undercut groove, 0, at its end, the object of the groove being to aid in securing a removable flange,-

E, on the end of the knob-shank B, which is accomplished in the manner Hereinafter described. The circularflange E and thetransverse tenon D are formed on a body which abuts closely against the end ofthe knob-shank B. The transverse tenon D fits accurately in the transverse groove 0. Thus the flange E is supported on the end of the knob-shank B. The tenon D enters the groove 0 at the side of the knob-shank, and the parts are so constructed that the strain or pull upon the knob cannot disengage them. There are corresponding spindle-sockets, H, in the body, on which the flange E and the tenon D are formed, and in the knob-shank B. I These spindle-sockets receive the knob-spindle l, by which the flange E is secured in position on the end of the knobshank B, the entrance of the spindle into the sockets forming a complete lock. The spindle fits without fastenings in the respective. knobshanks. The flange E is adapted to fit in a recess, K, in the rosette G, in which rosette there is an orifice, F, for the knob-shank B. The diameter of the flange E is about an eighth of an inch more than that of the knobshank B. This gives the flange secure holding in the rosette. Thus the knob A is secured on the door, the rosette being held in place by screws in theusual way; There are no screws, thread, or other appliance associated with the knob attachment, the flangeand the tenon, when in place, being parts of the knobshank. Thus simplicity and utility are united.

The mode of manufacture is substantially as follows: The groove and the tenon are partly formed in the castings. The grooving-toolsone for the groove and one for the tenon-are applied while the castings are in the rough The completion of the groove and the.

state. tenon is only a matter ofa few seconds. The tenon is then put in place in the groove in the knob-shank and the spindle, or a tool representing it, is passed into the spindle-sockets, .and the knob, the shank, and theflange are finished in the lathe as though they were cast solid, and when completed the joint in the knob shank is imperceptible. It will be seen that the process of manufacture is exceedingly simple, rapid, and economical, requiring few tools.

- The construction herei nbefore described, and shown in the drawings, may be reversedthat is, the tenon maybe formed on the knob-shank,- and the groove may be made in the part on which the tenon is now formed; but the present construction is preferable, the joint in the knob-shank being" less visible and the device being stronger.

In adjusting the parts the rosette G is passed upon the knob; shank B before putting the flange E in place. The rosette G may be made circular or. oblong, as per designs shown in thedrawings. adjusting, regardless of the thickness of the door, and it is adapted to all looks and latches. When applied to a rim-lock, asmall pin passed through the knobspindle between the lock and the door holds the inner knob in place, said knob'being riveted on the spindle. A

The knob attachment is self-*- small metal-lie door-protector, J, fits in the retoo Inadoor-knob attachment, the combination, gage a rosette, substantially as described, and with a. knob having a shank provided with a for the purpose set forth. IO transverse undercut groove at its end, of a That I claim the foregoing as my invention, flange having atransverse tenon in union therewitness my hand.

5 with, the tenon fitting in the groove in the knob-shank, and a knob-spindle by which the Witnesses:

flange is secured in position on the end of the C H. RUFF,

knob-shank, said flange being adapted to (211- F. H. SoHoT'r.

W. D. HUGHES. 

